1 files changed, 14 insertions, 2 deletions
diff --git a/spec/ruby/library/rbconfig/rbconfig_spec.rb b/spec/ruby/library/rbconfig/rbconfig_spec.rb
index caa557c32c..af74043c9c 100644
--- a/spec/ruby/library/rbconfig/rbconfig_spec.rb
+++ b/spec/ruby/library/rbconfig/rbconfig_spec.rb
@@ -1,11 +1,23 @@
 require_relative '../../spec_helper'
 require 'rbconfig'
 
-describe 'RbConfig::CONFIG values' do
-  it 'are all strings' do
+describe 'RbConfig::CONFIG' do
+  it 'values are all strings' do
     RbConfig::CONFIG.each do |k, v|
       k.should be_kind_of String
       v.should be_kind_of String
     end
   end
+
+  it "['rubylibdir'] returns the directory containing Ruby standard libraries" do
+    rubylibdir = RbConfig::CONFIG['rubylibdir']
+    File.directory?(rubylibdir).should == true
+    File.exist?("#{rubylibdir}/fileutils.rb").should == true
+  end
+
+  it "['archdir'] returns the directory containing standard libraries C extensions" do
+    archdir = RbConfig::CONFIG['archdir']
+    File.directory?(archdir).should == true
+    File.exist?("#{archdir}/etc.#{RbConfig::CONFIG['DLEXT']}").should == true
+  end
 end